Broach Cutters
Last updated on Sunday, August 15, 2021 12:32:33 PM Mountain US Time Zone

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Broach Cutting Set, Broach Holder & Shim, Bushing, Cutting

Broach Cutting Set

A duMont broach cutter Precision Set 00.
There are 15 different combinations
for making small keyways & bores.

Set consists of three broaches that
cut 1/16", 3/32" & 1/8" wide key
 ways & five, Type A collared bushings for 1/4",
5/16", 3/8", 7/16" & 1/2″ diameter holes.
The L-shaped shim is inserted after the
first pass to increase the depth-of-cut.

Use plenty of cutting fluid & remove all
chips after each pass.
Key & Keyway Sizes


Larger broaches. 3/16"-B cutter with its 5/8"-B collared
bushing. The 2nd one is a 5/16"-C cutter with a standard

1-3/16"-C collared bushing & a 30mm-C collared bushing
that is sized for the Jet BD-920N lathe spindle pulley.

The various bushing Types (A, B, C) match the broach
cutter base size with a corresponding bushing channel.


Each longer tooth cuts the
notch progressively deeper as
it is pressed through the part.

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Key Stock - steel, standard tolerances
Thicknesses: 3/16", 1/8", 1/4", 1
Widths: 3/16", 1/4", 3/8"
Lengths: 12" or 36"

 
A video on rotary broach cutting
a hex key recess, using a lathe.

https://www.youtube.com/watch?v=yHuwBwmV1OE


1-13mm drill chuck mounted on a center
bearing & MT2 arbor for use in the tailstock.
Can be used for rotary broach cutting, too.

  

 

 

  
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Broach Holder & Shim

An adapter was made to hold the
broach cutter to prevent breakage.
The holder has four, shank-gripping
set screws (like a 4-jaw chuck).  
A fifth set screw, inside the (smaller)
1/2" diameter end, limits shank depth &

 movement under cutting pressures.
I use it in the floor drill press.


Making a 3.25" cross-slide knob for the Jet 9x20 lathe.


Precision reamed 5/16" hole.

Bushing

A 5/16" guide bushing inserted into the hole.

Cutting

A 1/16" broach cutter held in the floor drill press.
Use ample amounts of cutting fluid.


Perfect broach-cut 1/16" keyway
to match the Taig OEM design.


Handle installed on the improved 9x20 lathe
cross slide using extra Taig mill lead screw parts.

   

     

   

 

 

  

  

  

 

 

 

  

 


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Broach Cutting Set, Broach Holder & Shim, Bushing, Cutting

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